Electrochemical study of TEOS, TEOS/MPTS, MPTS/MMA and TEOS/MPTS/MMA films on tin coated steel in 3.5% NaCl solution

Autor(es)

Sakai, R. T. ^[1] ; da Cruz, F. M. Di L. ^[2] ; de Melo, H. G. ^[3] ; Benedetti, A. V. ^[4] ; Santilli, C. V. ^[5] ; Suegama, P. H. ^[6]

Afiliação do(s) autor(es)

^[1] Fac Ciencias Exatas & Tecnol UFGD. Dourados

^[2] Univ Estadual Paulista. UNESP

^[3] Univ Sao Paulo. Dept Engn Quim

^[4] Univ Estadual Paulista. UNESP

^[5] Univ Estadual Paulista. UNESP

^[6] Fac Ciencias Exatas & Tecnol UFGD. Dourados

• Tipo de documento: Artigo de Revisão
• Fonte: Progress in Organic Coatings; v. 74, n. 2, SI, p. 288-301, JUN 2012.
• Citações Web of Science: 17

Resumo

This work compares the anticorrosion features of siloxane layers as eco-friendly alternatives for chromium passivation process on industrials tin coated steel and unravels the influence of each component of the film. The films were prepared with synergistic blends of siloxanes as tetraethyl orthosilane (TEOS), 3-methacryloxy-propyl-trimethoxysilane (MPTS) and methyl methacrylate (MMA). To assess the influence of each component, five different films were prepared: TEOS-based, MPTS-based, TEOS/MPTS, MPTS/MMA and TEOS/MPTS/MMA. The corrosion resistance of the coatings was evaluated by means of open circuit potential, anodic polarization curves and electrochemical impedance spectroscopy measurements, and the anticorrosion properties discussed based on electrical equivalent circuit fitting. Coated surfaces were analyzed using atomic force microscopy and the coatings' thicknesses were evaluated by means of glow discharge optical emission spectroscopy. The results plainly showed the efficiency of the anticorrosion properties of the film in a 35 wt.% NaCl solution and have clearly revealed the improvement of the protective properties of the coating when the MPTS was added to the formulations, pointing this component as the main responsible for the coating anticorrosion action. The addition of MMA to the formulation led to formation of coatings with low long term anticorrosion protection, which was ascribed to the low thickness. (C) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/53073-4 - Cerâmicas mesoporosas e hibridos orgânico-inorgânicos multifuncionais preparados pelo processo sol-gel
• Beneficiário: Celso Valentim Santilli
• Modalidade de apoio: Auxílio à Pesquisa - Temático